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The ancestors of corals were found in the Ediacarian – 635ma (Fossils found in the
Flinders Ranges, Sth Australia)
End of snowball Earth 2
Rise of Oxygen using Life
Bloblike Animals in the sea, nothing on land.
Australia Nth of Equator, Antarctica on the Equator & Amazonia at the South Pole
supercontinent Rodinia collided with another continent forming the new supercontinent, Pannotia (all the continents, South Pole).
Pan Africa – mountain building

In one of the Ancient Reefs like the enormous reefs over Wisconsin the corals (that had Nautiloids & Trilobites swimming about them) diverged into two groups. 
One of these groups had sets of six tentacles  
These became the Hexacorals
the Hexacorals split again to become the Hard Corals

              soft coral                                jellyfish and anemones          honeycomb and mushroom coral               Bushy hard corals                                 button coral
     Gorgonian, flower, tree and button coral  
    encrusting and lettuce coral                      Acropora corals                                brain coral                         gorgonian, flower & tree coral                        pine coral